This sounds most like precordial catch syndrome or a residual musculoskeletal/nerve issue from the prior injury. It is not dangerous, and usually improves with age, posture, and reassurance. However, if symptoms persist or worsen, a pediatrician or orthopedic review may be considered for imaging or therapy.
Next Steps
PCS and musculoskeletal pain are common and benign.
Posture correction & breathing exercises – helpful if related to PCS or muscle tightness. Avoid heavy backpacks or asymmetrical loads.
Trial of pain relief like Paracetamol or ibuprofen during painful episodes.
Warm compress over the area.
Physiotherapy if musculoskeletal cause is confirmed.
Consider further evaluation if:
Pain becomes progressively severe
If there's chest tenderness over ribs.
X-ray or ultrasound of chest wall if there's suspicion of soft tissue cause or unresolved trauma.
Health Tips
Red Flags to Rule Out Serious Issues:
These are unlikely in your case (since child is otherwise healthy), but must be watched for:
Pain with exertion.
Palpitations, dizziness, syncope.
Fever, cough, weight loss.
Local swelling or visible chest wall deformity.